Focusing device.



J. FREUD.

FOCUSING DEVICE.

APPLICATION FILED APR,15.1914.

1 121 1 78. l Patented Deo. I5, 1914,

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THE MORRIS PETERS C0.PHOTO-1.17110.WASHINQYQN, D c

JOSEPH FREUD, 0F CHICAGO, ILLINOIS.

FOCUSING DEVICE.

Speccation of Letters Patent.

Patented Dec. 15, 1914.

Application led April 15, 1914. Seral'No. 832,025.

To all whom t may concern:

Be it known that I, JOSEPH FREUD, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Focusing Devices, of which the following is a specification.

The main objects of this invention are to provide an improved form-of focusing bellows adapted for attachment to large cameras and to be used for locating or focusing images on the ground glass of the camera; to provide an improved construction and arrangement of lazy-tong mechanism for supporting and extending the bellows and adapted to permit a sidewise shifting thereof; to provide improved means for supporting said lazy-tong mechanism and limiting the extension thereof; and to provide improved means for locking the bellows in its collapsed position.

An illustrative embodiment of this invention is shown inthe accompanying drawings, in which:

Figure 1 is a side elevation of a focusing device embodying the foregoing improvements, the device being shown in its extended position. Fig. 2 is a sectional view of the same showing the device collapsed. Fig. 3 is an enlarged detail showing the manner in which the lazy-tongs are supported. Fig. t is an end view of the same taken from the' right of Fig. 3.

In the construction shown in the drawings, the frame members 5 and 6 are connected together by a pair of lazy-tongs 7, in such manner thatthe members 5 and 6 may be moved toward and away from each other for thepurpose of extending the hood 8, which is connected to the frame members 5 and 6, around the edges thereof. The lazy-tongs 7 are formed in the usual manner from a plurality of links and preferably made of thin spring steel so that the frame members 5 and 6 may be shifted sidewise relative to each other when the lazytongs are extended for the purpose of allowing the operator to change the angle of vision when focusing the image on the ground glass of the camera. The links are spaced apart axially with .respect to the pivotal connections of the links by having collars 9 interposed between the links and embracing the pivot pins 10. Springs 11k embrace the collars 9 located at the ends of the links and normally urge the lazy-tongs into their extended positions.

The lazy-tongs have the end links thereof connected at their intersections to fittings 12 on the frame 5 and fittings 13 on the frame 6 respectively, and are maintained horizontal during their movements by means of tracks or forks 11i rigidly secured to the fittings 12 and engaging the pivot pins 10.1,

connecting the intersecting links to which are pivoted the end links attached to the fittings 12. The extension of the lazy-tongs is limited by transversely disposed shoulders 15 integrally secured on the forks 14. and positioned so as to engage the pivot pins l0 connecting the ends of the lirst two pairs of links next to the fittings 12. The shoulders 15 are of such a length that they will prevent the disengagement of the pivot pins 10.1 and the forks 14.

Locking mechanism is provided for securing the lazy-tongs in their collapsed positions, which in the construction shown in the drawings comprises shoulders 16 secured to the frame 6 and located inwardly of the lazy-tongs, and arms 17 also located inwardly of the lazy-tongs and secured to the pivot pins 1S journaled in the fittings 12. The arms 17 are normally urged by gravity to cause the shoulders 19 formed thereon to engage the shoulders 16. A if-shaped lever 2O has the parallel arms thereof connected to the pivot pins 1S and is adapted to be swung so as to elevate the arms 17 for simultaneously releasing the shoulders 19 and 16. Shoulders 25 on the fittings 12 support the arms 17 in position to engage the shoulders 16.

.A head-piece 21, against which the operator mav rest his head when sighting, is secured to a disk 22 which is swiveled on the frame 6. The swiveled connection of the disk 22 is obtained by a ring 28 secured to an annular transverse flange 2st formed on the disk 22, and extending through the opening in the frame member 6.

The device is adapted to be attached to a camera by having the frame 5 suitably secured to that part of the camera which supports the ground glass. In large portrait cameras the ground glass is carried in a frame which is slidably mounted on the camera, so that the ground glass may be moved to one side and the plate simultaneously shifted into the position which the ground glass occupied.

f clearly on the ground glass.

erator may move closer to the ground glass by merely pushing inward on the frame 6, and the hood automatically follows the movement of the operators head toward or away from the camera. IIe may also shift the frame 6 to one side so as to change the angle of vision, the sidewise shifting being permitted by reason of the resiliency of the lazy-tong links. rIhe operator may also tilt the head causing the disk 22 to revolve on the frame 6. After the focusing has been completed, the frame 6 is pushed inwardly its full distance, whereupon the shoulders 19 iengage the shoulders 16 and the device becomes locked in its collapsed position. The device is then shifted away from the camera and the plate set in place.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim- 1. In a device of the class described, the

combination of a pair of frame members,

lazy-tongs secured at the intersection of the end links thereof to said frame members whereby said members are movable toward and away from each other, and means carried by one of said members and slidably supporting certain of the pivot pins connecting other links of said lazy-tongs at 'i their intersections.

2. In a device of the class described, the combination of a ypai; of frame members, a pair of lazy-tongs secured at the intersection of the end links thereof to said frame members whereby said members are movable toward and away from each other, and

tracks carried by one ofsaid members adjacent toeach of said lazy-tongs andA slidably supporting the respective pivot pins at the intersection of the links which connect 'with the `end links attached to said one frame member.

3. In a device of the class described, the combination of a pair of frame members, a pair of lazy-tongs secured at the intersection of the end links thereof to said frame members whereby said members are movsaid frame members,

able toward and away from each other, and means carried by one of said members and slidably supporting the pivot pins at the intersection of the links'which connect with vsaid end links, the links of said lazy-tongs being yfor-med of resilient material whereby said frames are adapted to be shifted sidewise relative to each other when said lazytongs are extended.

4. In a device of the class described, the combination of a pair of frame members, lazy-tongs secured at the ends thereof to said frame members, the links of said lazytongs being. spaced apart axially of the pivotalconnections thereof by means of collars on the pivot pins, and springs embracing the pivot pins .connecting the lazy-tong links at their ends and adapted to normally urge said lazy-tongs to shift said members apart.

5. In a device -of the class described, the combination .of a pair of frame members, lazy-tongs secured vat the ends thereof to said frame members,the links of said lazyt tongs being spaced apar-t axially'of the piv- :at their ends and adapted to normally urge said lazy-tongs to shift s aid'members apart,

and coacting shoulders on said frames adapted to have interlocking engagement for holding said lazy-tongs collapsed.

6. In a device of the class described, the combination of a pair of frame members, lazy-tongs secured at the ends lthereof to the links of said lazytongs .being spaced apart axially of the pivotal connections thereof by means of collars on. the pivot pins, springs embracing the pivot pins connecting the lazy-tong links at their ends and adapted to normally` urge said lazy-tongs to .shift said members apart, and shoulders on one of saidmembers positioned .so as to engage certain ofthe pivot pins of said lazy-tongs and limit the extension of said lazy-tongs.

7. In a device of the class described, the combination of a pair of frame members, a pair of lazy-tongs secured at the intersection of the end links thereof to said frame members, whereby said members are movable toward and away from each other, and forks carried on one of said members adjacent to each of said lazy-tongs and embracing the pivot pins at the intersection of the links which connect with the end links attached to said one member.

8. In a device of the class described, the combination of a pair of frame members, a pair of lazy-tongs secured at the intersection of the end links thereof to said frame members, whereby Vsaid members are movable toward and away from each other, forks carried on one of said members adjacent to each of said lazy-tongs and embrac- Copies of this patent may be obtained for ve cents each, by addressing the from each other, resilient means normally urging said lazy-tongs to shift said frames 15 apart, shoulders on one of said frames, and arms carried by the other frame and normally urged to engage said shoulders for holding said lazy-tongs collapsed.

Signed at Chicago this 13th day of April 20 JOSEPH FREUD.

Witnesses:

EDWIN PHELPS, M. IRENE HUTCHINGS.

Commissioner of latent:

Wuhington, D. C. 

